Fuel control system



June 15, 1937- B. L. MATTHEWSIS ET AL 2,083,789

FUEL CONTROL SYSTEM Filed Dec; 15, 1955 2 Sheets-Sheet 1 IN VENTORSB/RCH/IAO L. MA rr/wsws BY 44/0 JOHN 7. MAR \///V hWATTORNEY.

June 15, i937. B. n... MATTHEWS ET AL 2,083,789

FUEL CONTROL SYSTEM Filed Dec. 15, less 2 Sheets-Sheet 2 UINVENTORSQ/RCHARD L. NA 777%: W5

BY AND JOHN 77 MAR v/ Patented June 15, I937 HTED STATES PATENT p2,083,789 roar. oon'raor. SYSTEM Ohio Application December 13, 1933,Serial No. 702,162

2 Claims.

This invention relates to improvements in fuel control systems for gasburning appliances and in automatic valves for use in such systems.

An object of the invention is to provide an im- 5 proved valveconstruction of the type in which the cessation of the flow of gascauses a positive interruption of the gas flow to the main burner.

Another object is to provide a valve assembly so constructed andarranged that it maybe used 10 for the ignition of the oven burner of agas range with a constantly burning ignition pilot located inside theoven adjacent the main burner and with the moving parts of the '-valvedisposed in an accessible position outside the oven.

Other objects and advantages of the invention will be readily apparentfrom the following description and accompanying drawings wherein:

Fig. l is a diagrammatic view partly in section showing a fuel controlsystem incorporating a 20 valve embodying our invention;

Fig. 2 is a .view partly in section showing the valve in operatingposition with respect to the main oven burner of a gas range;

Fig. 3 is a view partly in section showing details 25 of one form of therunner arm construction;

. Fig. 4 is a view similar to Fig. 3 showing a modification of therunner arm construction;

Fig. 5 is another modification of the runner arm construction embodyinga slotted tube;

Figs. 6, '7, and 8 are end views of Figs. 3, 4, and 5 respectively, and

Figs. 9 and 10 are side elevational and end views respectively ofmodified forms of the bimetal attaching means.

Referring to the drawings for a detailed description of the invention, ldesignates the oven burner of a range which is supplied with gas from-amanifold I I through a conduit l2. A portion of the oven containing-theburner is indi- 40 cated in Fig. 2 by the numeral I3. A manuallyoperated gas cock I4 is interposed in the conduit l2 as areaconventional oven thermostat l and our improved automatic gascontrolling valve mechanism l6 whichforms the subject matter of 45 thepresent invention.- In the present illustration the improved valvemechanism is disposed between the gas cock and the thermostat.

The valve mechanism l6 comprises a cast valve body I! provided with aninlet port l8, an outlet 5 port l9 anda seat 28. The valve propercomprises a circular head member 2| cooperating with the seat 28 andprovided with a stem '22 projecting through one side of the valve body.Adjacent the stem the valve body is provided 4 55 with an upwardly andoutwardly extending flange against the seat 20.

23 to which is attached as by a screw 24, one end of acurved bi-metalmember 25. The other end of the bi-metal is attached to .the outer endof the stem 22 by a screw 26. The side of the valve body opposite thevalve head 2! is provided with a removable cap 21 having a recess 29therein for carrying a spring 28. This spring bears against the valvehead and tends to maintain it The inner end of this cap also serves as aseat 45 for cooperating with the valve head 2| as hereafter described.The valve head is moved to its'unseated position with respect to theseat 20 against the opposition of the spring 28 by the application ofheat to the bimetal 25.

The gas conveying mechanism 38 for supplying heat to the bi-metal ismounted on an L-shaped bracket 3| attached to the under side of thevalve body l1. This mechanism comprises, in the embodiment shown inFigs. 2 and 3, an elongated tubular casting 32 having an enlarged endportion 33. This end portion is mounted adjacent the bi-metal 25 and isprovided with a series'of ports 34 which serve as the burner for heatingthe bi-metal. The ports 34 communicate with a passage 35 which in turncommunicates with the tubular bore 36 of the casting 32. A series ofports 31 extend through the casting and communicate with the bore 36.

The undersideof the casting 32 supports a tube 38. One end of this tubecommunicates with a drilled opening 39 provided in the enlarged portion33, and which in turn communicates with a port orpassage 40 extendingthrough to the underside of the enlarged portion 33. The other end oftube 38 carries a burner tip 4| which terminates adjacent the outer ofthe series of ports 31.

Gaseous fuel is supplied to the pilot burner 4| directly from themanifold ll, through a conduit 42, manually operated shut-ofl valve 43,conduit 44, port 48, opening 39 and tube 38. This pilot therefore burnsconstantly regardless of the position of the fuel control devicesinterposed in the conduit I2, leading to the main or oven burner Ill.The fuel supply for the graduating or bi-metal heating pilot burner 34and runner'arm 31 is obtained through the fitting 46 which extendsthrough the cap 21, conduit 41, needle valve 48,

port 48 and bores 35 and 36.

Inthe operation of the device, assume that the oven is cold and the gascock l4 has been turned to the open position. The pilot burner 4| isconstantly lighted. The bi-metal 25 being cold, the valve head 2| isagainst seat 28 so that no fuel passes to the burner Ill. However, fuelpasses seat 45 and through fitting 46 as previously described to ports34 and 31. The gas issuing from those ports 31 adjacent the pilot 4i isignited and 5 from the other ports successively until the fuel issuingfrom ports 34 is ignited whereupon heating of the biemetal 25 begins.When the bimetal is sufliciently heated it causes the head 2| to moveaway from seat 20 whereupon fuel is supplied-to the main burner In andis ignited by the pilot 4|. As the heating of the bi-metal increases thehead 2| moves toward the seat 45 and thereby decreases the supply offuel to the ports 34 and 31. Thereupon the bi-metal 25 cools somewhatand the supply of fuel to ports and 31 is again increased. The movementof the valve head between the seats and 45 is so arranged that despitethe alternate cooling and heating of the bi-metal the supply of fuel tothe main 20 burnerv is not diminished beyond the maximum capacity of theburner, thus insuring constant operation of this burner except asregulated by the oven thermostat. However, should the gas supply fail inthe manifold ll, so that the grad- 2 uating burner 34 becomesextinguished, the bimetal 25 will cool sufliciently to permit the head2| to contact seat 20, and when the gas supply' is restored no fuel.will pass through the main burner until the pilot burner 4| isre-ignited.

It will be noted from Fig. 2, that the valve body 5, bi-metal member 25and all moving parts are located outside the oven with only the runnerarm and constant burning pilot 4[ inside. This accessibility presents anadvantage from the serv- 35 ice and replacement standpoint.

Fig. 4 represents a construction in which the tube 38 of Fig. 3 isreplaced by a bore 38' cast integrally with the runner arm 31.

In the modification shown in Fig. 5, 50 denotes a tube for conveyingfuel to a constantly burn-- ing pilot such as 4| in Fig. 3 and 5! is atube having a slot 52 therein which may be used instead of the portedrunner arm 31 of Fig. 3.

Figs. 9 and 10 show another manner of attaching the lower end of thebi-metal member 25 to the end of stem 22. The bi-metal is slottedasindicated at 53 and a nut 54 threaded on the end of the stem 22 fits inthis slot. The nut carries two oppositely extending pins 55 about eachof which one of the bi-furcated ends of the bi-metal is bent.

While we have shown and described several embodiments of the inventionit is obvious that other forms might be adopted, all coming within thescope of the appended claims.

We claim: 1

1. A device of the character described, an oven enclosure, 9. mainburner within the same, a source of fuel supply for said main burner, anautomatic valve insaid fuel supply line for controlling the supply offuel to the main burner, heat responsive means operating said valve,said valve and said heat responsive means being located outside saidoven; a constantly burning pilot within said oven and in ignitablerelation to the main burner, an elongated auxiliary burner extendingthrough anopening in the wall of said oven enclosure, a fuel supplyconnection between said valve and said auxiliary-burner, said auxiliaryburner having the end within the oven in ignitable relation. to saidconstant pilot, and the other end outside the oven in operatingrelationship to said heat responsive means, said auxiliaryburneroperating through said heat responsive means to open said valve tosupply fuel to the main burner, means associated with said valve andoperating toei'fect a reduction in the fuel supply to said auxiliaryburnerupon the opening of said valve, said auxiliary burner, heatresponsive means and valve operating to close off the fuel supply tosaid main burner upon extinguishment of said auxiliary burner.

.2. In combination, an oven, a main burner therein, a source of fuelsupply, a constantly burning pilot within the oven and in ignitablerelation to said burner, a valve controlling the fuel supply to the mainburner, heat responsive means operating said valve, said valve and saidheat responsive means being located exteriorly of the oven; and meanscomprising an auxiliary burner extending through an opening in said ovenfrom a point outside the oven to a point adjacent said pilot whereby tobe ignited from the latter,

and a-lateral extension on said auxiliary burner outside the ovencontrolling said heat responsive means, said auxiliary burner extensionprojecting at an angle to said opening in the oven whereby the heatresponsive means is positioned beyond the direct line of oven heatthrough said opening;

, said valve, heat responsive means and said auxiliary burner operatingto close off said main burner fuel supply upon extinguishment of saidauxiliary burner.

' BIRCHARD L. MATTHEWS.

JOHN T. MARVIN.

